/*
 * Copyright 2010, Red Hat, Inc. and individual contributors as indicated by the
 * @author tags. See the copyright.txt file in the distribution for a full
 * listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This software is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this software; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF
 * site: http://www.fsf.org.
 */
package org.zanata.search;

import org.hibernate.Query;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.search.FullTextSession;
import org.zanata.model.HTextFlowTarget;

/**
 * Indexing strategy specific to HTextFlowTargets. This indexing strategy
 * eagerly loads all of HTextFlowTarget's indexable relationships and fetches
 * its results in a memory-efficient manner.
 *
 * @author Carlos Munoz <a
 *         href="mailto:camunoz@redhat.com">camunoz@redhat.com</a>
 */
public class HTextFlowTargetIndexingStrategy extends
        AbstractIndexingStrategy<HTextFlowTarget> {
    public HTextFlowTargetIndexingStrategy() {
        super(HTextFlowTarget.class);
    }

    @Override
    protected void onEntityIndexed(int n, FullTextSession session) {
        // Nothing to do
    }

    @Override
    protected ScrollableResults queryResults(int ignoredOffset, FullTextSession session) {
        // TODO move this query into something like HTextFlowTargetStreamingDAO
        Query query =
                session.createQuery(
                                "from HTextFlowTarget tft "
                                        + "join fetch tft.locale "
                                        + "join fetch tft.textFlow "
                                        + "join fetch tft.textFlow.document "
                                        + "join fetch tft.textFlow.document.locale "
                                        + "join fetch tft.textFlow.document.projectIteration "
                                        + "join fetch tft.textFlow.document.projectIteration.project");
        query.setFetchSize(Integer.MIN_VALUE);
        return query.scroll(ScrollMode.FORWARD_ONLY);
    }
}
